HTTP methods express the intended action on a resource.

Common methods

• GET: retrieve a representation without intending to change server state.
• POST: submit data for processing, commonly to create a resource.
• PUT: generally replace the target resource representation.
• PATCH: apply partial modifications.
• DELETE: request removal of the target resource.

Idempotency

• An operation is idempotent if repeating the same request has the same intended effect on server state as doing it once.
• GET, PUT, and DELETE are defined as idempotent, although response codes may differ.
• POST is not inherently idempotent. Use idempotency keys for operations such as payment creation when duplicate effects must be avoided